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n.三个月；一学期
1、first trimester───[医][妊娠]前三个月，[妊娠]早期；早期妊娠
2、second trimester───中期妊娠
3、third trimester───[医]妊娠末三个月，妊娠晚期；晚期妊娠
4、ravenously hungry first trimester───怀孕前三个月极度饥饿
1、At the end of the first trimester, the fetus is about three inches long.───在怀孕的第三个月末，胎儿差不多有三英寸长了。
2、See your eye doctor within the first trimester of pregnancy.───在怀孕的前三个月要去看眼科医生。
3、Especially during the final trimester.───特别是在怀孕终期。
4、With that said, a woman will begin taking on some additional weight during the first trimester of the pregnancy stages.───也就是说，在这第一个三月期里，准妈妈们的体重会有所增加。
5、As the third trimester begins in week 26, the grooves deepen and the brain begins to look more like that of a newborn.───怀孕第7个月，也就是差不多在26周的时候，这些沟槽越来越深，婴儿的大脑就开始成形了。
6、The use of any painkiller during the second trimester more than doubled the risk of the condition in a boy baby.───在这段时间使用任何一种止痛药将使得宝宝的风险增加1倍。
7、She wore the air-monitoring backpack in 1999 when she was in the third trimester of her pregnancy with her oldest child, Patience.───在1999年当她怀着她三个月大的孩子时，那是他最大的孩子佩兴斯，她穿上了空气检测背包。
8、In each case, fetuses seem most vulnerable to these drugs in the first trimester of pregnancy, sometimes just a few weeks after conception.───一般说来，怀孕头三个月甚至是只怀孕几周的胎儿似乎最容易受这些药物的侵害。
9、The final or third trimester of the pregnancy stages is one in which the child, already fully differentiated, grows and takes on weight.───最后的三月期是已成形的婴儿生长，增加体重的时期。
1、The second trimester is generally the easiest part of a pregnancy.